Table 1. Solar cell parameters of single junction and double junction tandem devices prepared form SMPV1/PC₇₁BM.

Active layer	VOC (V)	JSC (mA cm−2)	PCE (%)	FF (%)
Single junction	0.93	11.4	7.2	68
Single junctiona	0.94	12.5	8.1	69
Single junctiona (Newport Certified)	0.937	12.17	8.02	70.4
Tandema	1.82	7.7	10.1	72

^aPDMS (0.5 mg ml⁻¹) was added to the active materials solution.